buds are yellow and fall off

Question

A lot of my buds are yellow and fall off, WHY! Was told over watering does it. It is not pot bound. It is in a very large container.

Answer 1

Bud drop in many plants can be caused by overwatering. If the container your plant is in is very large, overwatering is actually the most likely explanation. Plants in too-large containers can suffer from root damage and many other overwatering-related problems because the soil stays wet too long in a large container.

Other problems that can cause bud drop include pests on the plant or underwatering (if it's underwatered, the plant will appear wilted but they perk up when you water it).
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-flowers-hibiscus-blossoms-falling-off-plant.htm